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The Simple Network Management Protocol
(SNMP) is the protocol responsible for allowing network management stations
on a TCP/IP internetwork to perform management tasks with managed devices.
The core of the protocol consists of a set of protocol operations
that allow management information to be exchanged between SNMP agents
and managers. Having previously examined the generalities of SNMP and
what MIB objects are, we can now get down to the nitty gritty
of how management information is actually communicated using SNMP. Yes,
finally you get to actually see how SNMP works.

In this section I provide a detailed
description of the operations performed by the SNMP Protocol. I begin
with a general description of how SNMP operates and the two basic methods
devices use to communicate; I also describe SNMP's message classes.
I then provide topics that describe in detail each of the basic operations
performed in SNMP and the messages used for those purposes: basic request/response,
table traversal, object modification, and notification. I conclude with
a discussion of SNMP security issues and a summary of the security methods
in each of the SNMP versions.

Note that the number and types of
protocol operations in SNMP changed between SNMPv1 and SNMPv2. The operations
defined in SNMPv2 have been carried forward into the newest version,
SNMPv3. Most of the discussion focuses on SNMPv3 as the newest implementation,
while mentioning what differences there are between it and the original
and still widely-used SNMPv1.

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